Rowland, Eric, and Manon Stipulanti. “Avoiding 5/4-Powers on the Alphabet of Nonnegative Integers”. The Electronic Journal of Combinatorics 27, no. 3 (August 21, 2020): P3.42. Accessed March 27, 2026. https://www.combinatorics.org/ojs/index.php/eljc/article/view/v27i3p42.